Standard V1 (gray) vs. V1 Rev 2 (black) vs. V2 (White, LCD) vs. Centech (USB 3.0)

Standard V1 gray and black (Rev2):
There are now the second revision. Before the case was gray, now black. What else has changed:
+ Company logo in print instead of label (of a few millimeters was too big and looked easy cheap)
+ No separate power supply more

I suspect that has ceased to exist because the monitor now internally compensates for the loss, which I could find no measurement differences between the two. Presumably, the self-consumption is much too low or it is not precisely balanced and PortaPow simply saves now the possible accuracy completely a.

In the gray, I had the problem that the USB plug was the wrong way round. Ie plugged into the notebook showed the display down. I therefore had to open the case and turn the whole. Probably poor quality control in China.

Otherwise, the housing quality so la la. From measuring forth the V1 as the V2 is very accurate.

Standard V2:
The V2 I had imported my times from China (Aliexpress). So not PortaPow is exactly the same. So my also has the key and the blue backlight. Rear stands on it "KCX-017". The optically like an Apple-accessories-looking gauge is clear fancier, but only slightly better than the standard (V1). What he can do more:
+ Backlight (unfortunately very viewing angle dependent)
+ 0-9 measurements (AC mode can be reached by double-clicking any further change between measurements, reset think I long press, understood really, I have not so far)
+ Total consumption 4 digits in mAh (that you can see how much power the Smartphone total required for charging or for example, how much the Power Bank has a total delivered etc.)

What I lack in both:
- USB 3.0
- Max. Consumption (particularly the short peak loads when booting from hard drives me so far could spend a meter)

Ordered from China I have a USB Discharge Resistor. The 1A and 2A can unload. I find also very convenient for testing power supplies. Perhaps someone still finds something on Amazon.

Centech CT USB PW
I have before me V2 from Japan 54, - EUR order because it is the only one who supports USB 3.0. However, there are measurement differences in several trials and there are other readings when compared to the other USB instruments. So either all others are wrong or Centech and I go from fluctuations rather from the latter.

What has me still disturbed:
- You have to connect the Centech only without unit, he then calibrated to 0.00 amps. This is sometimes very impractical.
- Because it has no cable and more by the aforementioned Item always a high degree of leverage to the USB jack. One should therefore consider using a USB 3.0 extension. However, this should be as short as possible, because you can not determine exact measurements otherwise. This one could go: Delock USB 3.0 Type A plug (0.15m) black

Conclusion:
I would recommend the V2, as it has no disadvantages compared with the V1 and in addition can be read in the dark.